Surprise Billing and the No Surprises Act: Your Appeal Rights

Surprise medical bills — unexpected charges from out-of-network providers you didn't knowingly choose — were a leading cause of medical debt before 2022. The No Surprises Act changed the rules significantly. But violations still happen, and knowing how to fight a surprise bill is a critical patient skill. This guide explains what the law covers, where it falls short, and exactly how to dispute a bill that violates your rights.

What the No Surprises Act Covers

The No Surprises Act (NSA), effective January 1, 2022, protects patients in three main scenarios:

  1. Emergency services at any facility. You cannot be billed more than your in-network cost-sharing (your deductible, copay, and coinsurance) for emergency services, regardless of whether the facility or providers are in-network.
  2. Non-emergency services at in-network facilities from out-of-network providers. If you go to an in-network hospital or facility and are treated by an out-of-network specialist (like an anesthesiologist, radiologist, or hospitalist) without a meaningful choice, you pay only your in-network cost-sharing.
  3. Air ambulance services from out-of-network providers. You pay only your in-network cost-sharing for air ambulance transport, regardless of the ambulance company's network status.

The NSA also requires that providers give uninsured patients a Good Faith Estimate of expected costs before scheduled non-emergency services. This estimate is enforceable — if your final bill exceeds it by $400 or more, you can dispute it.

What the No Surprises Act Does NOT Cover

The NSA has important gaps. It does not apply to:

  • Ground ambulance services (state law varies widely)
  • Dental and vision services in most situations
  • Situations where you knowingly chose an out-of-network provider and signed a consent and waiver form (though the notice and consent requirements for this are strict)
  • Services provided at out-of-network facilities where you voluntarily chose to go

For denials related to out-of-network services outside of NSA protection, see our out-of-network denial appeal guide.

How to Dispute a Surprise Bill Under the No Surprises Act

If you receive a surprise bill that violates the NSA, here are the concrete steps to take:

  1. Do not pay the disputed portion of the bill yet. Contact the provider and tell them you believe the bill violates the No Surprises Act. Request that they correct the bill to reflect only your in-network cost-sharing.
  2. Contact your insurer. Call the member services number on your insurance card and report the surprise bill. Ask them to confirm that you are only responsible for your in-network cost-sharing for the service.
  3. File a complaint with the No Surprises Help Desk. Call 1-800-985-3059 or submit a complaint online at cms.gov/nosurprises. Include your EOB, the bill from the provider, and any other relevant documentation.
  4. File a complaint with your state Department of Insurance. Many states have their own surprise billing protections that may provide additional remedies. See our state DOI complaint guide.
  5. File a formal insurance appeal. If your insurer is incorrectly processing the claim, file an internal appeal citing the NSA. Use our free appeal letter builder to draft a professional letter.

The Independent Dispute Resolution Process

The NSA also created a federal Independent Dispute Resolution (IDR) process — but this is for disputes between providers and insurers about payment amounts. As a patient, you are shielded from this process: you pay only your in-network cost-sharing, and the provider and insurer work out the rest through IDR.

If a provider is trying to bill you directly for amounts beyond your in-network cost-sharing for an NSA-protected service, that is a violation. Report it to the No Surprises Help Desk and your state Department of Insurance.

Connecting Surprise Bills to Your Broader Appeal Strategy

Surprise billing disputes often intersect with general denial appeals. If your insurer processed the claim incorrectly — applying out-of-network cost-sharing when the NSA requires in-network rates — that is an appealable denial. Review your EOB codes carefully to identify how the insurer processed the claim, then file a formal internal appeal if it was processed incorrectly.

For emergency room surprise bills specifically, the NSA protections work in parallel with the federal emergency services rules. Review our ER denial appeal guide for the full picture.

Frequently Asked Questions

What is the No Surprises Act?
The No Surprises Act (NSA) is a federal law that took effect January 1, 2022. It protects patients from surprise medical bills in two main scenarios: (1) when out-of-network providers treat you at in-network facilities without your consent, and (2) for air ambulance services. Under the NSA, you pay only your in-network cost-sharing amount for these services, regardless of the provider's network status.
Does the No Surprises Act protect me from all surprise bills?
No. The NSA primarily protects you in emergency situations and when out-of-network providers treat you at in-network facilities without giving you a meaningful opportunity to choose. It does not cover ground ambulance, most dental and vision services, or situations where you voluntarily chose an out-of-network provider and signed a consent form.
What is the Good Faith Estimate and what do I do if my bill exceeds it?
The NSA requires providers to give uninsured or self-pay patients a Good Faith Estimate of expected costs before scheduled services. If your bill is $400 or more above the Good Faith Estimate, you can dispute it through the Patient-Provider Dispute Resolution process via CMS.gov.
How do I report a No Surprises Act violation?
Contact the No Surprises Help Desk at 1-800-985-3059 or visit cms.gov/nosurprises. You can also file a complaint with your state Department of Insurance if your state has its own surprise billing protections. Keep copies of all bills, EOBs, and any prior authorization or network status communications.

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